Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick
Data collected from 1954 to 1971 show that the recent decline in Miramichi River Atlantic salmon (Salmo salar) abundance has been accompanied by changes in the ratio of grilse to large salmon (2-sea-years and older) entering the river. From 1954 to 1962 trap samples were composed of about equal numb...
Published in: | Journal of the Fisheries Research Board of Canada |
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Canadian Science Publishing
1973
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crcansciencepubl:10.1139/f73-133 2023-12-17T10:27:16+01:00 Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick Ruggles, C. P. Turner, G. E. 1973 http://dx.doi.org/10.1139/f73-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/f73-133 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Journal of the Fisheries Research Board of Canada volume 30, issue 6, page 779-786 ISSN 0015-296X General Medicine journal-article 1973 crcansciencepubl https://doi.org/10.1139/f73-133 2023-11-19T13:38:37Z Data collected from 1954 to 1971 show that the recent decline in Miramichi River Atlantic salmon (Salmo salar) abundance has been accompanied by changes in the ratio of grilse to large salmon (2-sea-years and older) entering the river. From 1954 to 1962 trap samples were composed of about equal numbers of grilse and large salmon. Since 1963 the grilse catch has averaged 87%. Large declines in abundance of the fall-run grilse portion of the spawning stock occurred in 1968 and similar declines occurred in the fall-run large salmon component in 1969. An increase in commercial fishing mortality of large salmon is believed responsible for shifting the river escapement in favor of grilse. The result has been a reduction in reproductive potential and declines in the fall-run stocks of both large salmon and grilse. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing (via Crossref) Journal of the Fisheries Research Board of Canada 30 6 779 786 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Medicine |
spellingShingle |
General Medicine Ruggles, C. P. Turner, G. E. Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
topic_facet |
General Medicine |
description |
Data collected from 1954 to 1971 show that the recent decline in Miramichi River Atlantic salmon (Salmo salar) abundance has been accompanied by changes in the ratio of grilse to large salmon (2-sea-years and older) entering the river. From 1954 to 1962 trap samples were composed of about equal numbers of grilse and large salmon. Since 1963 the grilse catch has averaged 87%. Large declines in abundance of the fall-run grilse portion of the spawning stock occurred in 1968 and similar declines occurred in the fall-run large salmon component in 1969. An increase in commercial fishing mortality of large salmon is believed responsible for shifting the river escapement in favor of grilse. The result has been a reduction in reproductive potential and declines in the fall-run stocks of both large salmon and grilse. |
format |
Article in Journal/Newspaper |
author |
Ruggles, C. P. Turner, G. E. |
author_facet |
Ruggles, C. P. Turner, G. E. |
author_sort |
Ruggles, C. P. |
title |
Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
title_short |
Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
title_full |
Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
title_fullStr |
Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
title_full_unstemmed |
Recent Changes in Stock Composition of Atlantic Salmon ( Salmo salar ) in the Miramichi River, New Brunswick |
title_sort |
recent changes in stock composition of atlantic salmon ( salmo salar ) in the miramichi river, new brunswick |
publisher |
Canadian Science Publishing |
publishDate |
1973 |
url |
http://dx.doi.org/10.1139/f73-133 http://www.nrcresearchpress.com/doi/pdf/10.1139/f73-133 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of the Fisheries Research Board of Canada volume 30, issue 6, page 779-786 ISSN 0015-296X |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f73-133 |
container_title |
Journal of the Fisheries Research Board of Canada |
container_volume |
30 |
container_issue |
6 |
container_start_page |
779 |
op_container_end_page |
786 |
_version_ |
1785579073769046016 |